docs: def Brkic_2011_2(Re, eD):
      r'''Calculates Darcy friction factor using the method in Brkic
      (2011) [2]_ as shown in [1]_.
  
      .. math::
          f_d = [-2\log(\frac{2.18\beta}{Re}+ \frac{\epsilon}{3.71D})]^{-2}
  
      .. math::
          \beta = \ln \frac{Re}{1.816\ln\left(\frac{1.1Re}{\ln(1+1.1Re)}\right)}
  
      Parameters
      ----------
      Re : float
          Reynolds number, [-]
      eD : float
          Relative roughness, [-]
  
      Returns
      -------
      fd : float
          Darcy friction factor [-]
  
      Notes
      -----
      No range of validity specified for this equation.
  
      Examples
      --------
      >>> Brkic_2011_2(1E5, 1E-4)
      0.018619745410688716
  
      References
      ----------
      .. [1] Winning, H. and T. Coole. "Explicit Friction Factor Accuracy and
         Computational Efficiency for Turbulent Flow in Pipes." Flow, Turbulence
         and Combustion 90, no. 1 (January 1, 2013): 1-27.
         doi:10.1007/s10494-012-9419-7
      .. [2] 	Brkic, Dejan."Review of Explicit Approximations to the Colebrook
         Relation for Flow Friction." Journal of Petroleum Science and
         Engineering 77, no. 1 (April 2011): 34-48.
         doi:10.1016/j.petrol.2011.02.006.
      '''
      beta = log(Re/(1.816*log(1.1*Re/log(1+1.1*Re))))
      return (-2*log10(2.18*beta/Re + eD/3.71))**-2